Preparing method and use method of chlorinated organic compound polluted soil repairing agent

A technology for organic pollution and soil remediation, applied in the field of soil pollution control, can solve the problems of long processing time and low water solubility, and achieve the effect of high reaction effect, reduction of operation difficulty and cost saving.

Active Publication Date: 2016-02-03
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since most chlorinated organic compounds have very low water solubility and thus are mainly adsorbed on the surface of soil particles, even when using nano-loaded zero-valent iron to treat chlorinated organic-contaminated soil, an important problem still exists: how to make

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1:

[0023] The bentonite particles were added to deionized water, stirred for 8 hours, and centrifuged at 625 rpm for 7 minutes at low speed. According to the bentonite dosage 35g / L, add the bentonite particles to the 0.1M FeCl3 solution, mix for about 24 hours under the action of magnetic stirring, centrifuge to discard the supernatant, and repeat the above process twice to obtain Fe 3+ Saturated bentonite particles, then add deionized water for cleaning. After the iron ion saturated bentonite particles are put into deoxygenated deionized water, the pH of the solution is adjusted to 3 with 1M hydrochloric acid. Under the protection of inert gas, the NaBH 4 Quickly add to the particle slurry (NaBH 4 The molar ratio to Fe is 30:1), quickly close the cap, react at room temperature for 2 minutes, and centrifuge at high speed to obtain supported ultrafine zerovalent iron. The weight of 30 times the weight of the supported ultrafine zero valent iron particles is mixed ...

Example Embodiment

[0027] Example 2:

[0028] The bentonite particles were added to deionized water, stirred for 6 hours, and centrifuged at 600 low speed for 10 minutes. Add 20g / L of bentonite, and add the bentonite particles to 0.1M FeCl 3 In the solution, mix for about 24 hours under the action of magnetic stirring, centrifuge to discard the supernatant, repeat the above process 3 times to obtain Fe 3+ Saturated bentonite particles, then add deionized water for cleaning. After putting iron ion saturated bentonite particles into deoxygenated deionized water, adjust the pH of the solution to 2 with 1M hydrochloric acid, and under the protection of inert gas, the NaBH 4 Quickly add to the particle slurry (NaBH 4 The molar ratio to Fe is 25:1), quickly close the cap, react for 1 minute at room temperature, and centrifuge at high speed to obtain supported ultrafine zerovalent iron. Mix the 95% propanol solution with a weight of 20 times the weight of the ultra-fine zero-valent iron particles with a p...

Example Embodiment

[0034] Example 3:

[0035] The bentonite particles were added to deionized water, stirred for 9 hours, and centrifuged at 650 rpm for 5 minutes at low speed. According to the bentonite dosage of 45g / L, add the bentonite particles to the 0.1M FeCl3 solution, mix for about 24 hours under the action of magnetic stirring, centrifuge to discard the supernatant, and repeat the above process twice to obtain Fe 3+ Saturated bentonite particles, then add deionized water for cleaning. After the iron ion saturated bentonite particles are put into deoxygenated deionized water, the pH of the solution is adjusted to 3 with 1M hydrochloric acid. Under the protection of inert gas, the NaBH 4 Quickly add to the particle slurry (NaBH 4 The molar ratio to Fe is 30:1), quickly close the cap, react at room temperature for 2 minutes, and centrifuge at high speed to obtain supported ultrafine zerovalent iron. Ethanol with a purity of 95% or more is mixed with the supported ultrafine zero valent iron in...

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Abstract

The invention discloses a preparing method and a use method of a chlorinated organic compound polluted soil repairing agent. The preparing method comprises: adding bentonite particles into deionized water, agitating, centrifuging at a low speed and removing particles of which the particle size is larger than 2 micrometers; adding the bentonite particles into a 0.1M FeCl3 solution according to an adding amount of 20-50g/L, agitating, mixing, centrifuging to remove supernatant, obtaining Fe3+ saturated bentonite particles, and washing; putting iron ion saturated bentonite particles into de-oxidized and deionized water, regulating the pH of a solution to 2 to 3.5, rapidly adding NaBH4 into particle paste under inert gas protection, rapidly covering a bottle cap, reacting for 1-3 minutes at a room temperature, and centrifuging at a high speed so as to obtain supported type ultrafine zero-valent iron; and 4), mixing alcohol of which the purity is higher than 95% with the supported type ultrafine zero-valent iron according to a ratio of 20-40:1, preparing the repairing agent, sealing and storing. Chlorinated organic compound polluted soil is synchronously treated by using an organic cosolvent and the zero-valent iron. The method can improve the soil repairing efficiency under the condition of saving cost and lowering actual operation difficulty.

Description

Technical field: [0001] The invention belongs to the technical field of soil pollution control, and relates to a preparation method and a use method of a chlorinated organic polluted soil remediation agent. Background technique: [0002] Common chlorinated organic pollutants have tertiary effects and endocrine disrupting effects on the human body. They have been widely used in chemical and electrical products, and enter the natural environment in large quantities mainly through emissions, leakage, and volatilization [VanEmonJ.M., ChuangJ.C. Development and application of immunoaffinity chromatography for coplanar PCBs in soil and sediment. Chemosphere, 2013, 90(1): 1-6.]. Due to their low solubility and high stability, most chlorinated organic pollutants exist in soil and sediment, and may penetrate deeper, posing a threat to groundwater quality. Because of its refractory degradation and great harm, the remediation technology of chlorinated organic compounds polluted soil h...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 喻恺黄沈发杨洁王旌吉敏朱杰郭琳
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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